Hypodermic syringe



Dec. 11, 1928. 1,694,767

H. s. COOK HYPODERMIC SYRINGE Filed Aug. 5, 1922 27 3920 7 38 9 56 ,2 16 ;I We

Guam

s al view thereof;

Patente'd Dec; 11.1928.

'I.VU'NI' IE'D STATES, PATENT. OFFICE.

HARVEY S. 600K, 01? VALPARAISO, ,INDTANA, ASSIGNOR T0 COOK LABORATORIES, INC., 0F GHIGAGO, HJLINOIS, A GOBPOBATION 0F DELAWARE.

in'ronnmurc s nmen.

Application filed August 5, 1922. Serial No. mater.

This invention relates to hypodermic syringes, and

aims to providean improved syringe of the kind having or employing a cartridge or sealed medicament-container as a features, 1

constructions, combinations and sub-combinations exemplifiedin the accompanying drawings and particularly pointed 10' out in the annexed claims.

in said drawings Fig. 1 is a side elevation of a syringe embodying the invention' Fig. 2 is an enlarged longitudinal section- Fig. 3 is a sectional elevation of the front portion of a difierent the syringe, the section being in plane from that of Fig. 2 to show a lateral slot for insertion of the needle;

lFig. d is'a fragmentary view in side elevation of the rear end of the cartridge hold;

ing barrel,

Fig. 5 i

s an end elevation of the breech cap, viewed "from the front end'of the instrument nection between the breech cap and barrel;

Fig. 7 is an end elevation of the barrel por tion'of Fig 6;

Fig. 8 is a view like Fig. 6 showingan other form of connectionbetween the barrel and cap.

In the. drawings, 1 denotes a holder for the cartridge 36. The sorted endwise through holder as tridge hol cartridge may be inthe breech-end of the hereinafter explained. The carder is represented by a skeleton barrel Comprising cylindric end portions and longitudin there being wide longitudinal sight openings al connecting parts or strips 2,

35 in the opposite sides of the barrel whereof the pist the practitioner may observethe'contents of the glass cartridge tube and the posit onon plug 13 and plunger 12 during the fluid-ejecting operation. At its front end the barrel has a fixed head 3, which may be. attached by soldering or otherwise. 'A hypodermic needle 10 is removably connected with the barrel.

' double-poi ate enlargement d 3 in a substantially axial posi-- barrel hea tion so th The needle is shown as a needle having an. intermedi- 8, and is held in or by the nted at the inner end 9 of the needle extends into the barrel to pierce the rubber plug 38 in the fore end of the cartridge. The head 3 provides an abutment 5 for the fore end of the cartridge and has a recess -6 providing a seat for the needle enlargeflush with the abutment 5. The fore end of the barrel, including its head 3, has a radial slot 4 counicating with one of the sight openings 35. llhis permits the needle to be positioned in the cartridge-holder by passing the longer or outer branch 10 of the needle through the slot e while passing the needle enlargement 8 and its inner branch I 9 through the sight opening, and then moving the needle longitudinally to lodge its enlargement S in the recess 6 of the barrel head. Thus the needle may be easily and quickly positioned. As explained in my a plication Serial No. 5%,628 filed March '2, 1922, the needle may be takenfrom an asetic container by means of a cork sealing the container and in which the outer point 'f the needle is inserted, said cork serving as a handle by which the needle may be manipulated to insert it laterally into the cartridge-holder and then to position it, after which the cork may be removed, thus avoiding possible contamination by contact with the practitioners fingers.

i The cartridge -may consist of a straight glass tube having the pierceable plug 38 in its fore end and'having a piston plug 13 in its opposite end, these plugs being preferably of rubber or other suitable material and tightly fitted or compressed in the ends of the tube to provide effectual sealing closures or stoppers. Between the plugs is confined the solutidn of anesthetic or other medicament to be dispensed. The plug 38 is 7 shown having an inwardly facing axial recess, facilitating the piercing of the plug by the needle, while promoting effectual sealing of. the cartridge under the conditions of high pressure which may be created during ejection of themedicament. Said plug 38 is so placed that when the cartridge is incorrect position the outer face of the plug will bear on the abutment 5 and inner face of the needle enlargements, thusholding the needle seated by cpntact of the fore end of the cartridge with the needle enlargement. The pistonplug 13 may be a composite plug, formed of joined sections of rubber and cork, the rubber section being innermost because less liable to be attacked by the medicament, and the cork section being the larger of the two to economize on rubber.

The barrel has near its rear end a finger piece 7 which may be grasped by the fingers while pressing with the thumb on the knob 15 of the plunger rod 1 1 to push the piston plug 13 into or through the cartridge tube to expel the medicament through the needle. The barrel has a removable breech cap 17 longitudinally bored to provide a guide for the plunger rod 14, and which also serves to hold the cartridge 36 in place. Said breech cap has a hub 27 the inner end of which bears against the rear end of the cartridge tube. In this hub is a recess 22 for the plunger head '12 and the bore 23 for the plunger rod. This bore may be lengthened.

by a small diameter hub 18 on the outside of the cap 17. The removable breech cap 17 and plunger connected therewith may be handled as a unit because the outer end of the plunger rod 14 is threaded to receive the knob or thumb-piece 15 after the rod has been passed through the cap. The cap 17 may be removably, secured to the barrel in various ways. In Fig. 2, the cap 17 has an internally beaded flange 39 which engages an annular groove 19 in the barrel (Fig. 4). Said flange 39 is thinned by an external groove 28 and an internal groove 29, and as shown in Fig. 5 the said flange 39 is divided into a number of parts 21 by slots 20. By virtue oi the grooves28 and 29 the said parts 21 are somewhat elastic so that the flange may easily slip over the barrel end and snap into the groove 19 to hold the cap in place. The hub 27 may have its front edge beveled or rounded and the inside of the barrel may be similarly shaped to assist in the easy admission of the hub into the barrel as the cap is pressed home to move the cartridge into its operative position.

A slightly modified construction for re taining the breech cap in position is shown in Figs. 6 and 7. In Fig. 6, the inside of the barrel is slightly enlarged at 24 and the rear end of the barrel is longitudinally divided into elastic parts 26 by a number of slots 25. Each of the parts or fingers 26 has the same kind of an external groove 19 as in Fig, 2, into which the inner bead of the flange 39 of the cap 17 rests to hold the parts assembled. Still another construction is shown in Fig. 8. In this. figure, the hub 27 of the breech cap has a portion 31 of I enlarged diameter to fit in the enlarged'diameter 24 of the barrel. The barrel in this instance has the elastic fingers 33 with bent ends 34 to snap into the groove 32 of the breech cap, which is shown having a milled meme? flange 30. l'Vhichever of the constructionsis used, the breech cap can be applied very quickly and without considering its angular relation to the barrel itself. A turning of the cap on the barrel will not tendto loosen it as may be the case with certain other types of connections.

The operation of the syringe is very simple. The needle is first positioned as shown in Fig. 2 and then the cartridge is inserted through the opposite end of the barrel, the breech cap having been'first removed. The hub of the breech cap is then inserted into the barrel against the rear end of the cartridge, and the cap is then pressed into place, thus forcing the cartridge lengthwise against the needle. This causes the inner end of the needle to pierce the recess plug 38, and immediately the syringe is ready for an injection administration. A

pressure of the thumb on the thumb-piece 15,

as the syringe is held by the projections 7, forces the plunger rod 14 forward, thus carrying the plunger 12 with its concave face 16 against the piston plug 13. .As the pressure is continued the plug 13 moves forward througlt. the cartridge tube toward. the recessed closure 38 until the fluid is expelled, partially or entirely. In this action the plunger 12 by virtue of its concave front face 16 engages the piston plug 13 near its circumference, tending to prevent side spread of said plug 'and thus avoiding or reducing liability of cartridge breakage.

It will be seen that the described construction permits quick assemblage ofthe syringe organization, and provides an organization of efiicient character whereby injections may .be safely administered. The invention is not limited to the particular embodiment: shown, and its respective features are useful in various diflerent combinations and subcombinations.

A syringe cartridge or sealed medicament package comprising a tube having sealing plugs or stoppers in its opposite ends, one to .be pierced by a needle and the other to be forced inward to eject the fluid, said pierceable stopper being a recessed rubber plug of substantially the same kind, form and arrangement as the recessed pierceable plug herein shown and described, is the subjectmatter of and broadly and specifically claimed in my pending application filed July 1, 1921, Serial No. 481,997. A syringe comprising or embodying such a cartridge or a cartridge characterized by such a pierceable recessed stopper, with means associated therewith to provide an injection-administering organization, including a removably mounted needle to pierce such recessed pierceable stopper, is subject-matter disclosed in said application Ser. .No. 481,997 and in my pending application Serial No. 11,707 filed February 26, 1925 as a continuainsertion of t tion of an application filed by me April 8,

1921, Serial No. 451,680 which syringe or subject-matter is broadly and s ecifically claimed in my said application erial No. 11,707, the claims therefor being transferable to said application Serial No. 481,997. Therefore such a cartridge and syringe embodying the same are not claimed herein of said plugs being slidable through the tube to dispense the medicamentpa canula carried by the body and directed inwardly and having a point to pierce the plug which is opposite the'slidable plug; and a plunger movable into cont-act with said slidable plug and having its inner end provided with a cavity into which the slidable plug may expand to minimize breakage of the glass tube by radial expansion of the plug caused by the plunger; said cavity also permitting the canula to pierce the slidable plug, when it has been thrust hard against the initially pierced plug, without breaking the point OK.

2. A hypodermic syringe comprising, in combination, a medicament cartridge; a barrel capable of being opened for insertion of the cartridge; a double pointed hypodermic needle having an enlargement intermediate its ends and seated upon the barrel; and a closure for the barrel designed to retain the cartridge in position without substantial 1ongitudinal movement; said positioned cartridge holding the needle seated by contact of one end with the needle enlargement.

3. A hypodermic syringe comprising, in combination, a medicament cartridge; said cart-ridge having a resilient plug sealing one end; a barrel one end of which is open for he cartridge and the other end of which provides a sto for said cart-ridge; a needle having an en argcment seated in said other end of the barrel; and means constructed and arranged to retain the cartridge in position without substantial longitudinal movement; said cartridge in turn holding the needle in place by contact of its end plug with said enlargement.

4. A hypodermic springe comprising, in combination, a body; a medicament dispensing container constructed to hold a supply of medicament and to be held within said body; a double ended hypodermic needle, the inner point of which is constructed and arranged to pierce said medicament container; said body having a seat at one end for a part of the needle; the body having an opening into which the needle may be moved laterally to be seated without contamination by contact with the walls of the syringe; the syringe parts being constructed and arranged, when in operative position, to hold the needle seated and substantially immovable.

5. A hypodermic syringe comprising, in combination, a syringe body; a medicamentcontaining cartridge constructed and arranged to have its interior volume reduced and to be held by the body; a plunger on the syringe body for operating the cartridge; and a syringe head closing an opening at the end of the body and slidably receiving the plunger; said syringe head being held upon but quickly detachable from the syringe bodyby means of resilient fingers carried by one of said elements and snapping into an annular recess provided on the other element; and means for securing an injection needle at the opposite end of the syringe.

6. In a cartridge syringe, a cartridge-holding barrel in which the cartridge is insertill able endwise through the breech end; said rel, said breechhead having an extension in the barrel bearing against the butt end of the cartridge; whereby the breech head when being applied pushes the cartridge forward by said extension, and when the breech head is in place the cartridge is held substantially against longitudinal movement between the fore end of the barrel and the said extension of the breech head. V

In testimony whereof I aflix my signature.

HARVEY S. COOK. 

